Our fact check on Clive Palmer's wealth has created considerable interest and comment. As a result of the spirited commentary, we have updated the fact check with additional details on Mr Palmer's wealth. Our verdict - that his wealth in June 2012, based on publicly available information, was $1.13 billion - remains unchanged, but information has been added.

It was noted in The Australian that the initial fact check failed to fully account for the $415 million Mr Palmer's company Mineralogy received from the Chinese company Citic Pacific for the right to mine some of Mr Palmer's iron ore tenements in the Pilbara. As is now explained, Citic paid some of the money to Mineralogy and some to Mr Palmer personally.

The initial fact check stated that we did not assess any of Mr Palmer's personal assets that were not on the public record. Assets on the public record include those held through company structures and those in real estate. Assets not on the public record include personal bank accounts.

As is now reported, it is plausible that Citic's payments to Mr Palmer personally are the source of loans from him to Mineralogy and QNI Resources totalling $101 million that appear in the accounts for those companies. This sum was always included in the $1.13 billion conclusion. Mineralogy's historical accounts show it received $286 million in 2006-07.

While this seven-year-old transaction is interesting, it does not affect the verdict based on the most recent data available on the public record.

Similarly, we have updated the fact check to include the transfer of Coolum Resort within Mr Palmer's group of companies. The transfer of assets is interesting detail to Palmer watchers but does not change our calculation of his wealth.

It has been claimed that Mr Palmer owns share in more than 60 Australian private companies. We can only find 27, some of them too small to be required to file accounts publicly. He has some 75 directorships. If we find more we will revise our figures.

We have always acknowledged that assessments of Mr Palmer's wealth vary greatly, but our job as a fact checking unit is to assess what is on the public record and what can be documented. Where Mr Palmer's wealth - held in a corporate spider web of companies - is headed is a matter of speculation for others. Fact Check by its nature takes a view of his empire through a rear vision mirror.

Many of Mr Palmer's companies report long after their balance dates. His three biggest companies filed their accounts for the year to June 2012 in June 2013 and August 2013. When the companies file their 2013 accounts, Fact Check will update its work. In the meantime, others are free to analyse the likely impact on his wealth of developments such as changes in nickel prices.

Our fact check on Mr Palmer remains open, a work in progress. It will be updated as new information comes to hand. We welcome debate and commentary.

Free trade is the oldest argument in federal politics and the issue that literally defined the federation era but opposition exists to the TPP, courtesy of the Investor-State Dispute Resolutions clause.